Definition of: attrition

(ə·trish′ən)noun1. A rubbing out or grinding down, as by friction.2. A gradual wearing down or weakening: a war of attrition.3.Theol. Repentance for sin, arising from inferior motives; imperfect contrition (see under CONTRITION).[<L attritio, -onis rubbing, friction <atterere rub away <ad- to, against + terere rub]